jQuery Grid Plugin - jqGrid

Hi all,

I'm using the the getRowData() method without the rowid and I do not
receive all data in the grid into an array, I do not receive nothing,
but the grid has data.

The wiki said:

"If the rowid is not set the method return all the data from the grid in array".

But If I give the rowid everything works fine.

Where is the error?

My code is simply: jQuery("#grid_id").getRowData();